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问题 单项选择题

来得时之所以能注射1次作用24小时，是由于（）

A.等电点趋于中性

B.注射在皮下

C.分子结构更加稳定

D.以上都是

答案

参考答案：D

选择题

—I must look after my mother at home. She gets a stomachache.

—______ Can I help you?

—That's very kind of you. But I can manage it myself.

[ ]

A. I'm sorry to hear that.

B. Bad luck.

C. It doesn't matter.

D. What a shame.
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单项选择题

超低温冷库库温为（）℃。

A、-10~-2

B、-2~10

C、-10~-30

D、≤-30
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